Process of treating aluminum to facilitate the welding and soldering thereof



20 Iimingry 1 meme; 26, 1926'.

NITEDSTATES An rnun. 3130111101, or IEERANE; GERMANY: I

rumor.

Hammers 'rnn wnnmim mn-sonnnnme m Drawihg. Applioat1on ma October a,1925, Serial at. 01,273,- lniGermany larch v, 1924.

cium carbonate ma. ;be attributed to,elim-, 'ination of clay an 'otherimpurities from the, metal.

After meltin the-aluminum the scum is removed, andt e powdered calciumcarBon-' ate is'then added, and stirred. The calcium f I carbonateshould not be too finely powdered; 15 V The nature of the physical orchemical action produced by the calcium'carhonate' is stillobscure,except. in regard toits ultia mate efiect; which is that a lar .1 of theimpurities not .se ante pro by e prethe carbonate. The result may bedue, or inrpart'dueytoethe reduction'of oxides by-Qo 'c matter, or by.deco'm 'tion '0 matter, contain to this 1 invention powderedgkimmin'goft e molten metal are arated in the form of scumby the action intheeand drawn, for vexample ior making'tuhes and wire, and also furnishes a.very effe'ctive sol er for aluminum, even' if the aluminum J rom whichthe articles .to be soldered are made has not been treated by theprocess. A welding lamp is generally required lfor. the solderingoperation, the. 35 heat of ordinary ldering lamps being insuflicient. Y

B autogenous welding joints can be. ma e, whose strength exceeds that ofunwelded portions of the articles. What I claim as 'my'inven'tion anddesire to 'secure 'by Letters Patent of the United States is: v. e 1.The proess of treating aluminum for the purpose set forth, consistinginimelting 4 the aluminum-and mixing wdered calcium carbonate therewith,an removingthe scum from the'molten aluminum.

"2.\The process of treating alumm the aluminum and mixing powdered'cal-, cium carbonate therewith, 'the calcium carbonate' consistiniofpowdered sea-shells. A In witness-w specification. t v

--the purpose set forth,';consisting in melting 9.

ereof I have signed this l.

